Reactivity of crotonaldehyde and propene over Au/Pd(111) surfaces

James Naughton; Adam F. Lee; Sarah Thompson; C.P. Vinod; Karen Wilson

doi:10.1039/b921669c

Reactivity of crotonaldehyde and propene over Au/Pd(111) surfaces

James Naughton, Adam F. Lee, Sarah Thompson, C.P. Vinod, Karen Wilson

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Abstract

The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions ≥0.3 (crotonaldehyde) and ≥0.8 (CH); only ∼5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while CH combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.

Original language	English
Pages (from-to)	2670-2678
Number of pages	9
Journal	Physical Chemistry Chemical Physics
Volume	12
Issue number	11
Early online date	17 Dec 2009
DOIs	https://doi.org/10.1039/b921669c
Publication status	Published - Jan 2010

Bibliographical note

We thank the Engineering and Physical Sciences Research Council for financial support (EP/E046754/1; EP/G007594/1) and the award of a Leadership Fellowship (A.F.L.) and studentship (J.N.).

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abstract = "The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions ≥0.3 (crotonaldehyde) and ≥0.8 (CH); only ∼5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while CH combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.",

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AU - Lee, Adam F.

AU - Thompson, Sarah

AU - Vinod, C.P.

AU - Wilson, Karen

N1 - We thank the Engineering and Physical Sciences Research Council for financial support (EP/E046754/1; EP/G007594/1) and the award of a Leadership Fellowship (A.F.L.) and studentship (J.N.).

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N2 - The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions ≥0.3 (crotonaldehyde) and ≥0.8 (CH); only ∼5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while CH combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.

AB - The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions ≥0.3 (crotonaldehyde) and ≥0.8 (CH); only ∼5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while CH combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.

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Reactivity of crotonaldehyde and propene over Au/Pd(111) surfaces

Abstract

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